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/*
* Mesa 3-D graphics library
* Version: 6.5
*
* Copyright (C) 2005-2006 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* \file slang_assemble_conditional.c
* slang condtional expressions assembler
* \author Michal Krol
*/
#include "imports.h"
#include "slang_assemble.h"
#include "slang_compile.h"
/*
* _slang_assemble_logicaland()
*
* and:
* <left-expression>
* jumpz zero
* <right-expression>
* jump end
* zero:
* push 0
* end:
*/
GLboolean _slang_assemble_logicaland (slang_assemble_ctx *A, slang_operation *op)
{
GLuint zero_jump, end_jump;
/* evaluate left expression */
if (!_slang_assemble_operation (A, &op->children[0], slang_ref_forbid))
return GL_FALSE;
/* jump to pushing 0 if not true */
zero_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump_if_zero))
return GL_FALSE;
/* evaluate right expression */
if (!_slang_assemble_operation (A, &op->children[1], slang_ref_forbid))
return GL_FALSE;
/* jump to the end of the expression */
end_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump))
return GL_FALSE;
/* push 0 on stack */
A->file->code[zero_jump].param[0] = A->file->count;
if (!slang_assembly_file_push_literal (A->file, slang_asm_bool_push, (GLfloat) 0))
return GL_FALSE;
/* the end of the expression */
A->file->code[end_jump].param[0] = A->file->count;
return GL_TRUE;
}
/*
* _slang_assemble_logicalor()
*
* or:
* <left-expression>
* jumpz right
* push 1
* jump end
* right:
* <right-expression>
* end:
*/
GLboolean _slang_assemble_logicalor (slang_assemble_ctx *A, slang_operation *op)
{
GLuint right_jump, end_jump;
/* evaluate left expression */
if (!_slang_assemble_operation (A, &op->children[0], slang_ref_forbid))
return GL_FALSE;
/* jump to evaluation of right expression if not true */
right_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump_if_zero))
return GL_FALSE;
/* push 1 on stack */
if (!slang_assembly_file_push_literal (A->file, slang_asm_bool_push, (GLfloat) 1))
return GL_FALSE;
/* jump to the end of the expression */
end_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump))
return GL_FALSE;
/* evaluate right expression */
A->file->code[right_jump].param[0] = A->file->count;
if (!_slang_assemble_operation (A, &op->children[1], slang_ref_forbid))
return GL_FALSE;
/* the end of the expression */
A->file->code[end_jump].param[0] = A->file->count;
return GL_TRUE;
}
/*
* _slang_assemble_select()
*
* select:
* <condition-expression>
* jumpz false
* <true-expression>
* jump end
* false:
* <false-expression>
* end:
*/
GLboolean _slang_assemble_select (slang_assemble_ctx *A, slang_operation *op)
{
GLuint cond_jump, end_jump;
/* execute condition expression */
if (!_slang_assemble_operation (A, &op->children[0], slang_ref_forbid))
return GL_FALSE;
/* jump to false expression if not true */
cond_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump_if_zero))
return GL_FALSE;
/* execute true expression */
if (!_slang_assemble_operation (A, &op->children[1], slang_ref_forbid))
return GL_FALSE;
/* jump to the end of the expression */
end_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump))
return GL_FALSE;
/* resolve false point */
A->file->code[cond_jump].param[0] = A->file->count;
/* execute false expression */
if (!_slang_assemble_operation (A, &op->children[2], slang_ref_forbid))
return GL_FALSE;
/* resolve the end of the expression */
A->file->code[end_jump].param[0] = A->file->count;
return GL_TRUE;
}
/*
* _slang_assemble_for()
*
* for:
* <init-statement>
* jump start
* break:
* jump end
* continue:
* <loop-increment>
* start:
* <condition-statement>
* jumpz end
* <loop-body>
* jump continue
* end:
*/
GLboolean _slang_assemble_for (slang_assemble_ctx *A, slang_operation *op)
{
GLuint start_jump, end_jump, cond_jump;
GLuint break_label, cont_label;
slang_assembly_flow_control save_flow = A->flow;
/* execute initialization statement */
if (!_slang_assemble_operation (A, &op->children[0], slang_ref_forbid/*slang_ref_freelance*/))
return GL_FALSE;
if (!_slang_cleanup_stack (A, &op->children[0]))
return GL_FALSE;
/* skip the "go to the end of the loop" and loop-increment statements */
start_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump))
return GL_FALSE;
/* go to the end of the loop - break statements are directed here */
break_label = A->file->count;
end_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump))
return GL_FALSE;
/* resolve the beginning of the loop - continue statements are directed here */
cont_label = A->file->count;
/* execute loop-increment statement */
if (!_slang_assemble_operation (A, &op->children[2], slang_ref_forbid/*slang_ref_freelance*/))
return GL_FALSE;
if (!_slang_cleanup_stack (A, &op->children[2]))
return GL_FALSE;
/* resolve the condition point */
A->file->code[start_jump].param[0] = A->file->count;
/* execute condition statement */
if (!_slang_assemble_operation (A, &op->children[1], slang_ref_forbid))
return GL_FALSE;
/* jump to the end of the loop if not true */
cond_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump_if_zero))
return GL_FALSE;
/* execute loop body */
A->flow.loop_start = cont_label;
A->flow.loop_end = break_label;
if (!_slang_assemble_operation (A, &op->children[3], slang_ref_forbid/*slang_ref_freelance*/))
return GL_FALSE;
if (!_slang_cleanup_stack (A, &op->children[3]))
return GL_FALSE;
A->flow = save_flow;
/* go to the beginning of the loop */
if (!slang_assembly_file_push_label (A->file, slang_asm_jump, cont_label))
return GL_FALSE;
/* resolve the end of the loop */
A->file->code[end_jump].param[0] = A->file->count;
A->file->code[cond_jump].param[0] = A->file->count;
return GL_TRUE;
}
/*
* _slang_assemble_do()
*
* do:
* jump start
* break:
* jump end
* continue:
* jump condition
* start:
* <loop-body>
* condition:
* <condition-statement>
* jumpz end
* jump start
* end:
*/
GLboolean _slang_assemble_do (slang_assemble_ctx *A, slang_operation *op)
{
GLuint skip_jump, end_jump, cont_jump, cond_jump;
GLuint break_label, cont_label;
slang_assembly_flow_control save_flow = A->flow;
/* skip the "go to the end of the loop" and "go to condition" statements */
skip_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump))
return GL_FALSE;
/* go to the end of the loop - break statements are directed here */
break_label = A->file->count;
end_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump))
return GL_FALSE;
/* go to condition - continue statements are directed here */
cont_label = A->file->count;
cont_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump))
return GL_FALSE;
/* resolve the beginning of the loop */
A->file->code[skip_jump].param[0] = A->file->count;
/* execute loop body */
A->flow.loop_start = cont_label;
A->flow.loop_end = break_label;
if (!_slang_assemble_operation (A, &op->children[0], slang_ref_forbid/*slang_ref_freelance*/))
return GL_FALSE;
if (!_slang_cleanup_stack (A, &op->children[0]))
return GL_FALSE;
A->flow = save_flow;
/* resolve condition point */
A->file->code[cont_jump].param[0] = A->file->count;
/* execute condition statement */
if (!_slang_assemble_operation (A, &op->children[1], slang_ref_forbid))
return GL_FALSE;
/* jump to the end of the loop if not true */
cond_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump_if_zero))
return GL_FALSE;
/* jump to the beginning of the loop */
if (!slang_assembly_file_push_label (A->file, slang_asm_jump, A->file->code[skip_jump].param[0]))
return GL_FALSE;
/* resolve the end of the loop */
A->file->code[end_jump].param[0] = A->file->count;
A->file->code[cond_jump].param[0] = A->file->count;
return GL_TRUE;
}
/*
* _slang_assemble_while()
*
* while:
* jump continue
* break:
* jump end
* continue:
* <condition-statement>
* jumpz end
* <loop-body>
* jump continue
* end:
*/
GLboolean _slang_assemble_while (slang_assemble_ctx *A, slang_operation *op)
{
GLuint skip_jump, end_jump, cond_jump;
GLuint break_label;
slang_assembly_flow_control save_flow = A->flow;
/* skip the "go to the end of the loop" statement */
skip_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump))
return GL_FALSE;
/* go to the end of the loop - break statements are directed here */
break_label = A->file->count;
end_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump))
return GL_FALSE;
/* resolve the beginning of the loop - continue statements are directed here */
A->file->code[skip_jump].param[0] = A->file->count;
/* execute condition statement */
if (!_slang_assemble_operation (A, &op->children[0], slang_ref_forbid))
return GL_FALSE;
/* jump to the end of the loop if not true */
cond_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump_if_zero))
return GL_FALSE;
/* execute loop body */
A->flow.loop_start = A->file->code[skip_jump].param[0];
A->flow.loop_end = break_label;
if (!_slang_assemble_operation (A, &op->children[1], slang_ref_forbid/*slang_ref_freelance*/))
return GL_FALSE;
if (!_slang_cleanup_stack (A, &op->children[1]))
return GL_FALSE;
A->flow = save_flow;
/* jump to the beginning of the loop */
if (!slang_assembly_file_push_label (A->file, slang_asm_jump, A->file->code[skip_jump].param[0]))
return GL_FALSE;
/* resolve the end of the loop */
A->file->code[end_jump].param[0] = A->file->count;
A->file->code[cond_jump].param[0] = A->file->count;
return GL_TRUE;
}
/*
* _slang_assemble_if()
*
* if:
* <condition-statement>
* jumpz else
* <true-statement>
* jump end
* else:
* <false-statement>
* end:
*/
GLboolean _slang_assemble_if (slang_assemble_ctx *A, slang_operation *op)
{
GLuint cond_jump, else_jump;
/* execute condition statement */
if (!_slang_assemble_operation (A, &op->children[0], slang_ref_forbid))
return GL_FALSE;
/* jump to false-statement if not true */
cond_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump_if_zero))
return GL_FALSE;
/* execute true-statement */
if (!_slang_assemble_operation (A, &op->children[1], slang_ref_forbid/*slang_ref_freelance*/))
return GL_FALSE;
if (!_slang_cleanup_stack (A, &op->children[1]))
return GL_FALSE;
/* skip if-false statement */
else_jump = A->file->count;
if (!slang_assembly_file_push (A->file, slang_asm_jump))
return GL_FALSE;
/* resolve start of false-statement */
A->file->code[cond_jump].param[0] = A->file->count;
/* execute false-statement */
if (!_slang_assemble_operation (A, &op->children[2], slang_ref_forbid/*slang_ref_freelance*/))
return GL_FALSE;
if (!_slang_cleanup_stack (A, &op->children[2]))
return GL_FALSE;
/* resolve end of if-false statement */
A->file->code[else_jump].param[0] = A->file->count;
return GL_TRUE;
}
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